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Question

How much water should be filled in a container 21 cm in height, so that it appears half filled when viewed from the top of the container? (Given that  αμω=43)


  1. 8.0 cm
  2. 10.5 cm
  3. 12.0 cm
  4. None of the above


Solution

The correct option is C 12.0 cm

To see the container half-filled from top, water should be filled up to height x so that bottom 
of the container should appear to be raised upto height (21-x).
As shown in figure apparent depth h'=(21-x)
Real depth h=x


 u=hh43=x21xx=12 cm

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